FREE Master of Data Science Research & Data Analysis Questions and Answers

Question 1

Which of the following is a graphic device example?

Accepted Answer

All of the above

Answer

JPEG, SVG, and PDF are all common examples of graphic devices or file formats used for displaying and storing graphical output. JPEG is a raster image format, SVG is a vector graphics format, and PDF can contain both raster and vector graphics, making them all valid examples of graphic output types.

Question 2

Which of the following file types is exclusive to Windows graphic devices?

Accepted Answer

win.metafile

Answer

The `win.metafile` graphic device is exclusive to Windows operating systems. It creates a Windows Metafile (WMF) or Enhanced Metafile (EMF), which are vector graphics formats primarily used within the Windows environment. Other formats like SVG and PDF are cross-platform.

Question 3

Identify the incorrect statement.

Accepted Answer

Functions like xyplot in lattice will not default to sending a plot to the screen device

Answer

This statement is incorrect. Functions like `xyplot` in the `lattice` package, by default, *do* send their plots to the active screen device (e.g., an RStudio plot pane or a separate graphics window). This allows for immediate visualization during interactive data analysis. You only need to explicitly specify a different device if you want to save the plot to a file.

Question 4

The second objective of PCA is which of the following?

Accepted Answer

data compression

Answer

Principal Component Analysis (PCA) has two primary objectives. The first is statistical, identifying directions of maximum variance. The second key objective is `data compression` or dimensionality reduction, where the original high-dimensional data is projected onto a lower-dimensional space while retaining as much variance as possible, making it more manageable for analysis or visualization.

Question 5

Which of the subsequent annotation features adds or modifies text?

Accepted Answer

All of the above

Answer

Annotation features in plotting systems are used to add or modify elements on a graph to enhance clarity and information. This includes adding `lines` to highlight trends, adding `text` (often referred to as 'word' or labels) for explanations, and modifying various `graph` elements to improve presentation. Therefore, all these aspects contribute to the annotation process.

MS-DS Master of Data science Practice Test

MS-DS Master of Data science Practice Test

FREE Master of Data Science Research & Data Analysis Questions and Answers